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BULK GaAs NEGATIVE CONDUCTANCE AMPLIFIERS
1.H. W. Thim, M. R. Barber, B. W. Hakki, S. Knight, and M. Uenohara, Appl. Phys. Letters 7, 167 (1965).
2.H. W. Thim and M. R. Barber, IEEE Trans. Elect. Dev. ED‐13, 114 (1966).
3.B. W. Hakki and S. Knight, IEEE Trans. Elect. Dev. ED‐13, 94 (1966);
3.B. W. Hakki and J. P. Beccone, Proc. IEEE (Correspondence) 54, 916 (1966).
4.A. G. Foyt and T. M. Quist, IEEE Trans. Elect. Dev. ED‐13, 199 (1966).
5.D. E. McCumber and A. G. Chynoweth, IEEE Trans. Elect. Dev. ED‐13, 4 (1966).
6.B. K. Ridley and T. B. Watkins, Proc. Phys. Soc. 78, 293 (1961);
6.C. Hilsum, Proc. IRE 50, 185 (1962).
7.J. B. Gunn, IBM J. of Res. and Dev. 8, 141 (1964).
8.A. L. McWhorter, International Electron Devices Meeting, Washington, D.C., October 20–22, 1965.
9.P. N. Butcher and W. Fawcett, Proc. Phys. Soc. 86, 1205 (1965);
9.P. N. Butcher and W. Fawcett, Phys. Letters 21, 489 (1966).
10.E. M. Conwell and M. O. Vassell, IEEE Trans. Elect. Dev. ED‐13, 22 (1966) and to be published.
11.P. N. Butcher, Phys. Letters 19, 546 (1965);
11.P. N. Butcher, W. Fawcett, and C. Hilsum, Brit. J. Appl. Phys. 17, 841 (1966).
12.J. A. Copeland, IEEE Trans. Elect. Dev. ED‐13, 189 (1966);
12.J. A. Copeland, J. Appl. Phys. 37, 3602 (1966).
13.S. Mahrous and P. N. Robson, [Electronics Letters 2, 107 (1966)], have calculated the impedance of GaAs amplifiers using a three‐slope approximation to the υ vs E curve of Butcher and Fawcett,9 but they did not attempt a comparison with experiment.
14.J. B. Gunn and B. J. Elliott, Phys. Letters (to be published) have recently inferred from very short pulse measurements on GaAs that the negative mobility is only about However, J. A. Copeland (to be published) has shown that their observations can be explained with a negative mobility of the size found here if the low‐field hole generation rate which he deduced from other experiments [J. A. Copeland, Appl. Phys. Letters 9, 140 (1966)] is taken into account. The extent to which such hole generation would modify the present results has not yet been determined.
15.W. Shockley, Bell System Tech. J. 33, 799 (1954).
16.The intervalley transfer rate estimated in ref. 10 is much greater than our maximum frequency of 5 GHz.
17.If the expression simplifies considerably; the result for this case is given in ref. 13.
18.H. W. Thim, IEEE Trans. Elect. Dev. (to be published).
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